The steps are as follows:
Download Metamask and follow the install instructions for you’re O/S
Visit https://metamask.io/
Hit "Download" in the menu bar.
Click “Install MetaMask for Chrome”. You will be directed to the Chrome Web Store.

Click “Add to Chrome”.
On the pop up, click “Add extension”.
Then follow the on-screen instructions step-by-step to complete the initial setup.
Below is walkthrough video of the entire process:

